Crankpin grinding apparatus



July 15, 1941. F KLI'NE- l ,2,249,388 CRANKPIN GRINDING APPARATUS Filed June 6, 1940 4 Sheets-Sheet 1 ATTORNEY July -15, 1941. L F KLINE 2,249,388

CRANKP IN GRINDING APPRATUS Filed June 6,' 1@4o 4 sheets-sheet 2 INVENTOR @Cef/ww, inail 6- ATTORNEY' July 15, 1941. L F 'KLlNE 2,249,388

4CRANKPIN GRINDING APPARATUS 4 sheets-sheets Filed June 6, 1940 INVENTOR ATTORNEY July 15, 1941.

L. F. KLlNE CRANKPIN GRNDING APPARATUS 4 Sheets-Sheet 4 Filed June 6, 1940 E lC-T-LU ,s lNvr-:NToR

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naar.' C ATTORNEY% Patented July 15, 1941 UNITED STATES PAT ENT -OF'FICE cRANKPm GRINDING APPARATUsi j `Leon F. Kline, Frankll'niWrVa. y Application June 6, 1940, Serial No. 339,189

a grinding machine for the purpose menor its crankshaft. Another object is to provide a grinding machine of the type stated having a Fig. 3 is a front View of the device `in operative position, Fig. 4 is a rear view of the same, y

Fig.` 5 is a side elevation ofa grinding head and supportembodied in the invention, I

Fig.` 6 is a sectional View on the line'S-.Sf of Fig. -5, Y f

Fig. 7 is a vertical transverse-section through the grinding head and one of its surrounding straps, taken on the line 1 1 of Fig. 9,

Fig.` 8 is a similar view-taken on the line 8 8 of Fig. 9,

Fig. 9 is a vertical longitudinal section through the grinding head with its surrounding straps, taken on the line 9 9 of Fig. 7,

Fig. 10 is a sectional vievv on the lineV Ill-I0 of Fig, 7, y

Fig..11 is a perspective view of a grinding unit forming a portion of thegrinding head,

Fig. 12 isa perspective view of a supporting clip for the grinding unit,

Fig. 13 is an enlarged detail view, tion and partly in elevation,

f Fig. 14 is a section on the line III-I4 of Fig. 13,

Fig. 15 is an enlarged detail, partly in section, illustrating certain parts of the mechanism for rocking the motor, and

Fig. 16 is a section on the line I 6I 6 of Fig. 15. The present invention,

partly in secs claims.. (01. "S11-73?; f

connected to the upper face of which is a bracket I I havingupstanding ears I2 pivoted to which, by means of a bolt I3, are the depending ears I4 of a plate I5. -The-plate I 5 is adapted to rock in a verticalplane and secured to its upper face, as'by bolts I6, is-an electric motor I'l having a shaft I8 the-'ends of which'protrude beyond the ends ofthe motor casing. YConnected to a rear edge portion ofthe plate erally therefromis a tubular Vlug I9, the bore of as hereinbefore menmeans of a `spacer bar 30a. -As-'shown in Fig.H-13, a pair of disks 32 are the under side of Aa bar 36, said stud having a 2. slot 35h through its wall adapted to register with a recess 34a in the lug 34. At opposite sides of the stud 35, the bar 36 is provided with longitudinal slots 31. Resting upon the bar 36 directly above each of the slots 31 is an end of one of a pair of supporting rods indicated generally at 38 each of which has a threaded lug 39 extending from its lower end and through one of the slots 31. The rods 38 are each formed of upper sections 38a and lower sections 38h ad, justably connected together by bolts 38o passing through slots 38d in the lower sections as shown. By this means, the rods may be lengthened or shortened. The lugs 39 are provided with nuts 49 by means of which the rods v33 may be.

clamped to the bar 36 after they have been adjusted to proper spaced relation. The upper end portions of the rods 39 are maintained in proper spaced relation by means of a spacing sleeve 4| of suitable length positioned therebetween. A bolt 42 having anut 43 threaded thereon passes through the rods 38 and through thesleeve 4I to hold therods in contact with the sleeve.

Loosely connected to the upper end of each of the supporting rods 38 by -means of a pivot 44 is an annular strap 45 each of which loosely encircles anv end portion of Va tubular grinding head 46 adapted to be rotated by Aa sprocket 41 formed integral therewith intermediate its ends, Awhich latter lare provided with circumscribingflanges 43. yThese flanges serve to hold the straps 45 against lateralvmovement beyond the ends of the grinding head 46. rI he sprocket 41 is rotated rby a chain 41a. leading from a sprocket 21a secured on the shaft 21 between disks32. The tension of the chain 41a. may be adjusted by lengthening or shortening the supporting rods l38.

Each strap 45 includes lower and upper semicircular sections 45a. and 45h, respectively. The ends of these sections are provid d withradially projecting ears, those of the lower sections being designated at 49 and those ,of the upper sections being designated at 50. Headed adjusting screws l pass loosely through perforations inthe ears 49 and are threaded into perforationsin the ears 59. C'oil springs 52 surround the Screws 5l bee tween their heads and the adjacent ears 49 which draw the sections of the straps springs tend kto together. Projecting radially downward 4 from the center of each of the lower sections 45a of the straps 45 is a lug 53 which is bifurcated to receive the upper end of one of the supporting rods `38. The pivots 44 pass through the upper ends of the connecting rods and through the furcations of the lugs 53 whereby to provide a pivotal connection between the rods 38 and the straps 45.

As shown in Figs. 1 and 8 of the drawings, the grinding` headS is formed of two. semi-Y circular sections 46m and 46h, as a result of which construction the grinding head may be readily placed in surrounding relation to acrankpin A of a shaft B where its Vsections are held against displacement by their surrounding straps 45. Removably mounted on the inner facesv of the sections of the grinding head and extending axially thereacross yare spaced elongated grinding units 54 formed of abrasive material. The inner faces of these grinding units are correspondingly concaved,4 as at 55, according to rthe curvature to which the surface o f the crankpin is to be nshed. and t Yeir. side walls 56. converge towardstheir concaved surfaces to a slight degree so as to fit snugly within metal supporting clips A series of S'Ihaving converging side walls 58.

' strips and into the sections 46a and 4617.

the supporting clips, with the grinding units therein, are mounted on the inner face of each of the semi-circular sections of the grinding head, the clips being held in spaced relation by means of clamping strips designated in general at 59. At the end of the inner face of each semicircular section of the grinding head a single clamping strip 59a is attached by means of screws 60 which pass therethrough. The strips 59a serve as abutments for the endmost of the supporting clips while the intermediate clamping strips 59h are arranged in pairs, each pair being held in position by screws 6l which pass between the The confronting edges of the strips of each pair are recessed as at 62 to receive the screws 6|, and the upper ends of the recesses are flared to receive the beveled heads of said screws. As a result of this arrangement, the strips 59a will be forced apart upon tightening of the screws 6I, so as to exert a clamping action upon the supporting clips 51, which will result in holding the grinding units rmlylin position.

In Fig. 14, 62 designates a gauge clip including a head 62a from which projects a pair of outer legs 62D and a central leg 62o. The use of this gauge clip will be described later herein as will also theuse of a brace-supporting socket 63 shown in Fig. 4. y

Pivoted to the basev I0 is a brace 64 which is -used as a support for the frame 25 and the attached parts when the device is not in use. At that time the brace is swung upwardly so as to engage beneath the spacing bar 39a..

When putting the, present invention to use for grinding a crankpin inl the engine of a motor vehicle, without'rst removing either the engine or its shaft, therlower section of the crankcase if ,nrst removed after which the connecting rods are disconne ted from the crankpin to be ground, and the grinding head 46 is placed in surrounding relation to the crankpin.` The sections 45a and; 45h of the straps 45 are then placed around the grinding head where they are held bythe screws 5l having the springs 52 thereon, afterwhich the chain 41 is-placed in position on the sprockets 46 and 21a. The. parts as thus assembled are illustrated in Fig. l.

Before the grinding operation takes place, it is necessary to make sure that the. axis of the grinding head and that of the countershaft 21 are parallel', This is Vaccomplished by turning the crank 22 so as to swing the plate I5 and the partsa'ttached thereto inv onedirection orthe other until the leg 62e of the gauge clip 62 may be passed freely through theslot 35a and into the recess k34a. in the lug4 34 while the legs 62h of the gauge clip are at the same time caused to engage opposite sides of the stud 35, as shown in Fig. 14. The gaugeclip is then removed before the grinding operation takes place.

Grinding heads oi diiferent internal diameters and of diiferent lengths may be used, according to the make of crankshaft to beground. The internal diameter ofV the grinding head may be varied by placing a shim of, suitable thickness beneath each of the supporting clips 51.

Due to the fact. that the crankpin will .be of greater diameter at the beginning of an operation than when the work is completed, the ends of the grinding head lsections 46a. and `4Gb will stand apartsomewhat at the start.,V as will also the ears 49 and 5B on the sections of the straps 45. Asjthe grinding operationr progresses, the spring 52'will tend to draw the strap sections be drawn together `until ltheir Y In order to hold the grinding machine Vin a xed'pos'itionbeneath the motor car, a suitable -bracerod may b'e' placed "restingin vthe Vsocket 63 `engaging "a suitable part Vin position withone end land with itsvother end of the under portion of 'the motor vehicle.

pivotally supported on the ends of the shaft I8, also due to the fact that the disks 32 are loosely mounted on the shaft 21.

While the operation of this device has been described as taking place Without removing from the motor vehicle either the engine or its shaft, it is to be understood that the invention may removed and mounted in a lathe.

What is claimed is: 1. An apparatus for other end of the grinding means.

2. An apparatus for grinding the crankpins of a motor vehicle crankshaft or the like, comand means operable by the rotatable shaft for rotating the grinding means.

3. An apparatus for grinding the of a motor Vehicle crankshaft or the This will cause a dis- 1 grinding means 4. apparatus lfor Ygrinding the crankpins 'oi'fafmotorjvehicle crankshaft or the hke, comrotating the grinding means.

5. An apparatus for grinding the crankpins of a motor vehicle crankshaft or the like, com- `adapted for positioning beneath g support, grinding means rotatably mounted in said straps, said grinding means comprising semi-cylindrical sections adapted to be assembled in surrounding relation to a crankpin, each of said sections having grinding units disposed axlally in spaced relation upon grinding means.

6. An apparatus for grinding the crankpins of a motor vehicle crankshaft or the like, comprising a base adapted for a motor Vehicle, a rotatable tatably mounted in said straps, said grinding comprising semi-cylindrical adapted to operable by the countershaft for rotating the grinding means.

7. An apparatus for grinding the of a motor Vehicle crankshaft or the 11ke, comporting rods carried by said bar and having their lower ends mounted in said slots for advjustment .toward *and 'away from each other,

said supporting rods comprising upper and lower sections connected together for longitudinal adjustment, straps pivotally connected to the other end .of the support, grinding means rotatably mounted in said straps, said grinding means comprising semi-cylindrical sections adapted to be assembled in surrounding relation to a crankpin, each of said sections having grinding units disposed axially in spaced relation upon its inner face, means for clamping the grinding units to the semi-cylindrical sections, and means operable by the countershaft for rotating the grinding means.

8. An apparatus for grinding the crankpins of a motor vehicle crankshaft or the like,compris ing a base adapted for positioning beneath amotor vehicle, a rotatable countershaft pivotally connected to the base, means for rotating said shaft,

disks loosely mounted on the havingan end adjustably connected to saiddisks, straps pivotally connected shaft, a support to the otherend of the support, grinding means rotatably mounted in said straps, said grinding means comprising rvsemi-cylindrical sections adapted to be assembled in surrounding relation to a crankpin, each of said sections having `supporting clips disposed in spaced relation upon its inner surface, grinding means mounted in said clips,` pairs of clamping strips positioned between certain of the supporting clips and adapted to be moved into clamping engagement with said clips, and screws threaded into said sections between the clamping strips of each pair, the under sides of the heads of said screws being beveled whereby tightening of said screws will spread the clamping strips into tight engagement with the supporting clips.

' 1 LEON F. KLINE. 

